Lochinvar Knight 80 - 285 - Manual (Page 46)

Installation & Operation Manual
46
9
Condensate disposal
Condensate drain
1. This boiler is a high efficiency appliance that produces
condensate.
2. The side of the boiler has a 1/2 inch PVC union for
connection of a 1/2 inch PVC pipe (FIG. 9-1).
3. Slope condensate tubing down and away from the boiler
into a drain or condensate neutralizing filter. Condensate
from the Knight boiler will be slightly acidic (typically
with a pH from 3 to 5). Install a neutralizing filter if
required by local codes.
A Neutralizer Kit (FIG. 9-1) is available from the factory
(Kit 3087).
4. Install the 1/2 inch PVC tee assembly (shipped with the
unit) as shown in FIG. 9-1.
5. Leave the top of the 1/2 inch tee OPEN. This is needed as
a vacuum break.
6. Do not expose condensate line to freezing temperatures.
7. Use only plastic tubing or piping as a condensate drain
line (FIG. 9-1).
Use materials approved by the authority
having jurisdiction. In the absence of
other authority, PVC and CPVC pipe must
comply with ASTM D1785 or D2845.
Cement and primer must comply with
ASME D2564 or F493. For Canada use
CSA or ULC certified PVC or CPVC pipe,
fittings, and cement.
8. A condensate removal pump is required if boiler is below
drain. When installing a condensate pump, select one
approved for use with condensing boilers and furnaces.
The pump should have an overflow switch to prevent
property damage from condensate spillage. The switch
should be wired to the auxiliary device proving switch
terminals on the low voltage connection board.
NOTICE
NOTICE
To allow for proper drainage on large
horizontal runs, a second line vent may be
required and tubing size may need to
increase to 1 inch.
The condensate line must remain
unobstructed, allowing free flow of
condensate. If condensate is allowed to
freeze in the line or if the line is obstructed
in any other manner, condensate can exit
from the boiler tee, resulting in potential
water damage to property.
Figure 9-1 Condensate Disposal